The stresses in cemented joints, specially lap joints, were studied photoelastically. The photoelastic mcdels were made of epoxy resin and epoxy rubber or epoxy resin and metal, namely, each material had its own elastic constant. The shapes of the adhesive joints are a rectangular type, with a fillet, with convex or concave semi-circular ends. According to the results of experiments, the fillet is more effective for reducing the high stresses in lap joints. The other result has revealed that the joint with concave semi-circular ends is best, one with rectangular ends is second best and one with convex semi-circular ends is worst of all so far as the stresses in lap joints are concerned.